AN INTRODUCTION OF LENS AND POPULAR TYPES OF LENS NOWADAYS

Nowadays, eyeglasses have become more and more essential. It is undeniable that eyeglasses play an extremely important role in correcting the refractive error as well as preventing eye diseases. When choosing a pair of eyeglasses, as well as choosing a rim that suits your face and personality, choosing a lens is also considerable. If you have refractive errors (nearsightedness, farsightedness, astigmatism, presbyopia) and always need eyeglasses, the importance of the lens should be understood.

The latest lenses are made of special plastic, which can resist impact and withstand extremely high forces. Compared with glass material, the plastic is lighter, more aesthetic, easier to grind, to dye and preserve. In terms of lens design, the ‘single-lens’, which can only applied for a constant distance, are mostly used. But for over-40-year-old people, who find difficulty in seeing nearer, “bifocals or multifocal lenses” are chosen to help them see clearly in both near and far distance .

In addition to correcting refractive error, eyeglasses also protect the eyes via “special coatings”. Standard anti-UV lenses can protect eyes with up to “100% UV from the sun or other sources”. Moreover, some lenses can be coated with an anti-blue light harmful layer. These lenses can protect your eyes from electronic devices light and reduce the risk of suffering from retina diseases. There are some other coatings such as scratch resistance, or anti-glare to minimize blinding caused by the lights on the opposite sites during night travel. Besides, you can also choose lenses with special abilities such as “color changing”. Due to the special design of the molecules inside, when being exposed to UV rays, the plastic material changes from transparent to another color. These special eyeglasses can replace sunglasses and they are extremely convenient.

In conclusion, many different types of lenses are invented to meet human needs. People should carefully choose the best qualified lens to effectively protect the eyes from dangerous agents such as harmful rays from the sun and electronic devices. Visiting the Polyclinic of the Pham Ngoc Thach University, our specialists will help you choose the most suitable eyeglasses for yourself.